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-rw-r--r--lib/stdlib/src/io_lib.erl24
1 files changed, 19 insertions, 5 deletions
diff --git a/lib/stdlib/src/io_lib.erl b/lib/stdlib/src/io_lib.erl
index a91143a764..28e5007e5a 100644
--- a/lib/stdlib/src/io_lib.erl
+++ b/lib/stdlib/src/io_lib.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2016. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
@@ -68,8 +68,8 @@
-export([write_atom/1,write_string/1,write_string/2,write_latin1_string/1,
write_latin1_string/2, write_char/1, write_latin1_char/1]).
--export([write_string_as_latin1/1, write_string_as_latin1/2,
- write_char_as_latin1/1]).
+-export([write_atom_as_latin1/1, write_string_as_latin1/1,
+ write_string_as_latin1/2, write_char_as_latin1/1]).
-export([quote_atom/2, char_list/1, latin1_char_list/1,
deep_char_list/1, deep_latin1_char_list/1,
@@ -344,6 +344,11 @@ write_binary_body(B, _D) ->
<<X:L>> = B,
[integer_to_list(X),$:,integer_to_list(L)].
+%%% There are two functions to write Unicode atoms:
+%%% - they both escape control characters < 160;
+%%% - write_atom() never escapes characters >= 160;
+%%% - write_atom_as_latin1() also escapes characters >= 255.
+
%% write_atom(Atom) -> [Char]
%% Generate the list of characters needed to print an atom.
@@ -351,17 +356,26 @@ write_binary_body(B, _D) ->
Atom :: atom().
write_atom(Atom) ->
+ write_possibly_quoted_atom(Atom, fun write_string/2).
+
+-spec write_atom_as_latin1(Atom) -> latin1_string() when
+ Atom :: atom().
+
+write_atom_as_latin1(Atom) ->
+ write_possibly_quoted_atom(Atom, fun write_string_as_latin1/2).
+
+write_possibly_quoted_atom(Atom, PFun) ->
Chars = atom_to_list(Atom),
case quote_atom(Atom, Chars) of
true ->
- write_string(Chars, $'); %'
+ PFun(Chars, $'); %'
false ->
Chars
end.
%% quote_atom(Atom, CharList)
%% Return 'true' if atom with chars in CharList needs to be quoted, else
-%% return 'false'.
+%% return 'false'. Notice that characters >= 160 are always quoted.
-spec quote_atom(atom(), chars()) -> boolean().